Integrated spectral encoder/decoder for optical CDMA communication system

A spectral encoder/decoder, comprising:

• a directional coupler for splitting an input optical signal into first and second output signals;
• an arrayed waveguide grating (AWG) optically coupled to the directional coupler, wherein the AWG is configured to receive the first and second output signals at first and second ends, respectively, and to output the first and second output signals as first and second sets of individual spectral components, respectively;
• a phase controller optically coupled to the first and second ends of the AWG for selectively imparting a phase shift on the individual spectral components output by the AWG;
• a redirector for redirecting the first and second set of individual spectral components back through the AWG, wherein the redirected first and second set of individual spectral components exit from respective ends of the AWG as first and second multiplexed signals, and re-enter the directional coupler.

A spectral encoder/decoder, comprising:

• a directional coupler for splitting an input optical signal into first and second output signals;
• an arrayed waveguide grating (AWG) optically coupled to the directional coupler, wherein the AWG is configured to receive the first and second output signals at first and second ends, respectively, and to output the first and second output signals from the second and first ends as first and second sets of individual spectral components, respectively;
• a phase controller optically coupled to the first and second ends of the AWG for selectively imparting a phase shift on the individual spectral components output by the AWG;
• and
• a redirector for redirecting the first and second set of individual spectral components back through the AWG through the second and first ends, respectively, wherein the redirected first and second set of individual spectral components exit from the first and second ends of the AWG as first and second multiplexed signals, respectively and re-enter the directional coupler.